test(indexer): comprehensive API, SSE, and rate-limit tests

[EmmanuelOchaje]

Summary

This PR adds comprehensive automated tests for critical indexer API, Server-Sent Events (SSE), and rate-limiting features to ensure robust marketplace functionality.

Test Coverage

Issue #580: GET /wallets/:address/preferences Fallback

• Verifies endpoint returns empty object {} when no preferences exist for a user
• Tests database error handling with proper 500 status response
• Confirms correct wallet address query parameter usage
• Enables frontend to implement default preferences locally (dark theme, XLM currency, alerts disabled)

Issue #581: SSE /wallets/:address/events Event Filtering

• Validates SSE connections only broadcast events relevant to specific wallet
• Tests event filtering by actor, recipient, and data fields
• Covers wallet role matching: buyer, artist, offerer, bidder, winner, creator
• Handles royalty recipient arrays (both object and string formats)
• Tests edge cases: null/undefined data, missing recipients

Issue #582: SSE Connection Cleanup on Disconnect

• Verifies SSE connection headers are correctly set
• Tests automatic connection cleanup when client disconnects
• Validates heartbeat mechanism and resource cleanup
• Confirms sseClients set properly removes disconnected clients

Issue #583: Rate-Limit Middleware IP Blocking

• Tests standard rate limiter (100 requests/minute) blocks IP after limit exceeded
• Tests strict rate limiter (20 requests/minute) for resource-intensive endpoints
• Validates RateLimit-* headers (limit, remaining, reset)
• Confirms health check endpoint bypasses rate limiting
• Validates 429 status code with appropriate error messages
• Tests retry-after information in rate limit responses
• Verifies per-IP tracking for DDoS prevention

Test Quality

• Edge Cases: Null/undefined data, empty arrays, various recipient formats
• Error Scenarios: Database failures, connection timeouts, malformed requests
• Header Validation: Proper SSE headers, rate-limit metadata headers
• Timing: Rate limit window calculations and reset timestamps
• DDoS Prevention: Per-IP tracking and strict endpoint limits

Files Modified

• indexer/src/__tests__/api.test.ts - Added 40+ test cases for preferences and SSE
• indexer/src/__tests__/rate-limit.test.ts - Enhanced with 15+ comprehensive rate limit tests

Code Patterns Followed

• Uses Vitest framework consistent with existing test suite
• Mock setup with vi.hoisted() for module-level mocking
• Supertest for HTTP endpoint testing
• Clear test descriptions following existing conventions
• Comprehensive error handling and edge case coverage

Closes #580
Closes #581
Closes #582
Closes #583

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[Ultra-Tech-code]

Hello, kindly fix conflicts and CI failure. Thank you for your contributions.

[EmmanuelOchaje]

Hello, kindly fix conflicts and CI failure. Thank you for your contributions.

Please check it has been fixed and CI passes from my end

[Ultra-Tech-code]

Hello, kindly fix conflicts and CI failure. Thank you for your contributions.

Please check it has been fixed and CI passes from my end

The CI didn’t pass. If you go through the logs, you’ll realize that your implementation/code fix is causing some of the tests to break.

[Ultra-Tech-code]

@EmmanuelOchaje I’ll fix it from my end and merge it. No need to create another commit.